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I'm working on a circuit that charges up a capacitor bank to around 72V and then discharges it into a spark gap. I would like to measure the current through the spark gap. These pulses are ~20usec in duration, peak at around 70-100A and repeat at ~5kHz.

I am concerned that the inductance in the cables will make it such that the spark gap is continuing to get significant current even after my output switch has been turned off. I was hoping to use a current probe to look at the output current waveform.

I was planning to use a current probe like this: https://www.amazon.com/Current-CP2100B-measurable-70-7Arms-Measuring/dp/B09NQ7GTVY

But the datasheet (https://www.micsig.com/uploads/MicsigCP2100CurrentProbeDatasheet_1661755307.pdf) shows a heavy derating curve past ~200kHz: enter image description here

Do I need to be worried about this causing issues/burning out the current probe? Would it be better to use a diff probe + a shunt resistor to make this measurement?

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  • \$\begingroup\$ You might have some issues depending on the slew rates. Maybe look into Pearson's wide-bandwidth current transformers? \$\endgroup\$
    – Hearth
    Commented Dec 22, 2023 at 3:48
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    \$\begingroup\$ See also Rogowski coil. \$\endgroup\$
    – Dave Tweed
    Commented Dec 22, 2023 at 3:50
  • \$\begingroup\$ Would these solutions work for effectively measuring the low frequency (~5kHz) components of this and have enough bandwidth for the higher frequency stuff too? \$\endgroup\$
    – Dhruv Goel
    Commented Dec 22, 2023 at 6:54
  • \$\begingroup\$ I almost don't believe it has a bandwidth of 2.5MHz for only $400. \$\endgroup\$
    – DKNguyen
    Commented Dec 22, 2023 at 7:01
  • \$\begingroup\$ Please provide a link to the data sheet of the probe. \$\endgroup\$
    – Andy aka
    Commented Dec 22, 2023 at 10:40

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